Mounting piece for mounting a sign



FIG. 1 is a bottom plan view of a mounting piece for mounting a sign showing my new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a top front perspective view thereof. 

The ornamental design for a mounting piece for mounting a sign, as shown and described. 